Pneumatic diaphragm.



J. KNAGGE.

PNEUMATIC DIAPHRAGM.

Patented Feb. 22, 1916.

Jzveafor:

'EQTNITED JOSEPH KNAGGE, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO THE BALDWIN COMPANY, OF CINCINNATI, OHIO.

PNEUMATIC DIAIHRAGM.

Application filed July 24, 1915.

To all ii /2.0m it may concern:

Be it known that I, Josnrir KNAGGE, a citizen of the United States, residing at Chicago Heights, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pneumatic Diaphragms, of which the following is a specification.

The cbject of my invention is to improve the action on the diaphragm by making it very sensitive for rapid action, thus bringing about the dynamic effect and musical expression in playing auto pneumatic piano playing devices or other devices where a sensitive operation isrequired. I also ar range the parts in a very simple, compact and durable form, thus giving excellent efficiency of operation while making the manufacturing cost very low. Previous structure in this art have been either the bellows pneumatic or the diaphragm pneumatic. The bellows type of the rectangular form was expensive and cumbersome. The diaphragm type of flexible material over a circular depression only. required more space and a very careful forming to this large cup or socket.

The present device is especially useful in that it requires less space, is cheaper to manufacture, and is so constructed that the flexible material passes over a flat and solid surface, which enables the diaphragm to re spo-nd quickly and uniformly thus giving immediate and better results.

in the drawing, Figure 1 is a plan view embodying the pneumatic diaphragm of the present invention. Fig. 2 is a side view and Fig. 3 an end view.

A supporting bed 1 has rectangular faces as 2 and 3 and the like bounded by depressions as 4, 5, 6, 7 and 8. Stretched over these rectangular faces is a sheet of flexible material which is pressed and glued into the depressions, thus forming the diaphragm 9. These depressions may be rabbeted as 4, transverse groove as 5, double as 6, coved as 7, general. depression as 8, or other suitable form. Grooves for two edges only may be employed, and the other edges of the diaphragm fastened to the face as at 10. Ports 17, nipples 18, and tubes 19, or similar elements. form air ducts leading to the under face of said freely disposed material to effect the inflation and deflation of said dia- Specification. of Letters Patent.

Patented Feb. 22, 1916.

Serial No. 41,776.

phragm, to actuate any movable element or member as the button 12. A wedge may be inserted as 11 or the like. A button 12 lightly rests on each of the diaphragms. A recess, cup or socket 13, 14 may also be provided in such face under the position of the button 12, thus allowing the button to de press the flexible material to enable the dia phragm to have greater motion than when the face as 15 has no such recess. The diaphragm over such recess will thus respond more quickly and efficiently. The sockets may be larger than the button 12 as sockets 13, or smaller than such button as 14, in the latter case the edge of'the socket 14 would serve to hold the button 12 to correct height on bed 1 instead of the button resting on the yielding diaphragm 9 as with socket 13. If more economical results are desired or less space required the supporting bed need not extend beyond the depression 4. as at 16. but terminate as at 4. The double depressions between each face, as at 6 and 11 makes it easy to replace one or more of the pouches without disturbing any of the others.

hat I claim as my invention is:

1. A supporting bed having a rectangular face bounded by depressed parts of said bed, and diaphragm of flexible material freely disposed over said face and attached to said bed in said depressed parts immediately adjacent said rectangular face, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

2. A supporting bed having a series of adjacent rectangular faces disposed in a row in one plane, and depressed parts of said bed between each two of the said faces and also at the edges of said faces that are not adiacent, and a diaphragm of flexible material freely disposed over said faces and attached to said bed in said depressed parts immediately adjacent said rectangular faces, and having the said freely disposed part of said dia hragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

3. A supporting bed having a series of adjaeent rectangular faces disposed in a row in one plane and depressed parts of said bed between each said face and the adjacent faces, and a diaphragm of flexible material freely disposed over said faces and attached to said bed in said depressed parts imme diately adjacent said rectangular faces, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

A supporting bed having a rectangular face bounded by depressed parts of said bed, and a diaphragm offlexible material freely disposed over said face and attached to said bed in said depressed parts immediately adjacent said rectangular face by means of a fixed wedge inserted therein, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

5. A supporting bed having a face bounded by a depressed part of said bed and a diaphragm of flexible material freely disposed over said face and attached to said bed in said depressed part immediately adjacent said face, and having the said freely disposed part of said diaphragm movable to ward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

6. A supporting bed having a rectangular face bounded by two depressed parts of said bed between each two of said rectangular faces, and a diaphragm of flexible material freely disposed. over each said face and attached to said bed in said depressed parts immediately adjacent said rectangular face, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flcxible material. 7

7. A supporting bed having a rectangular face bounded by two depressed parts of said bed between each two of said rectangular faces, and a diaphragm consisting of a single piece of flexible material freely disposed over both said faces and attached to said bed in said depressed parts immediately adjacent said rectangular face, and having the said freely disposed part of said diaphragm movable toward and away from said bed,

and an air duct connection leading to the under face of said freely disposed flexible material.

8. A supporting bed having a rectangular face bounded by depressed parts of said bed, and a recess in said face, but separate from said depressed parts, and a diaphragm flexible material freely disposed over said face and recess and attached to said bed in said depressed parts immediately adjacent said rectangular face, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an duct connection leading to the under face of said freely disposed flexible material.

9. A supporting bed having a socket in the face tl ereof, and a flexible diaphragm freely disposed over said socket and extending beyond the dimensions of said socket over said face, and attached to said bed distant from said socket only, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

10A pneumatic diaphragm of flexible material disposed over a socket less in area than said diaphragm, and follower button disposed on the face of the said diaphragm opposite to the said socket, the said button being of greater area than said socket at the part of said button adjacent said socket, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposel flexible material.

11.1 pneumatic diaphragm of flexible material disposed over a socket less in area than said diaphragm, and a follower buttion disposed on the face of the said diaphragm opposite to the said socket, the said button being of greater area than said socket, and having the said freely disposed part of said diaphragm movable toward and away from said bed, and an air duct connection leading to the under face of said freely disposed flexible material.

JQSEPH KNAGGE. lVitnesse H. Eanon, C. Annnsson.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

